Lock



ay 8, 1934. L. GUTMAN 1,957,586

LOCK I Filed Sept. 12, 1931 /N/ENTOR L GUTMAN fgNE V Patenfeol May 8,134

UNITED STATES PATENT OFFECE LOCK Louis Gutman, Brooklyn, N. Y., assivnorto American Telephone and Telegraph Company, a corporation of New YorkApplication September 12, 1931, Serial 'No. 562,574

5 Claims. (Cl. 70-75) This invention relates to improvements in locks.at their other ends against the spring post 25. The object of theinvention is the improvement The lower end of the bolt 7 has an opening26 of lever type locks to prevent the fraudulent which fits over post 11serving to keep the bolt operation thereof. in alignment on withdrawal.A stationary par- 5' According to one feature of the invention a tition27, as shown arranged between the movable oo lever type lock is providedin which access to the levers 9 and 10, is supported by posts 11 andbolt control portion of the levers through the keywhich extend throughthe openings 28 and 29 reslot is prevented. spectively in the partition27. This partition 27 Specifically there is provided a housing for theextends to the very edge of the slot 2 when the :10' key cylinder of thelock which has a projection barrel 1 is in its normal position and hasits adjacent to and in contact with that portion of edge 30 notched tocorrespond to the configurathe levers above the key cylinder when thelock tion of the keyslot 2 to enable the partition 27 to bolt is in itslocked position. have its face 30 as close as possible to key 3 whenReferring to the drawing, Figure 1 is a front it is inserted in the slot2 and also to prevent a -view of the lock according to this inventionwith key without the correct fluting from passing the cover removed toshow the barrel housing and partition 27. The barrel 1 has a slot 31 toenable the levers or tumblers; the barrel 1 to avoid partition 27 whenrotated Fig. 2 is an exploded perspective View of that by the key 3.

, portion of the lock shown by Fig. 1 with the oper- The levers 8, 9 and10 have notches 32, 33 and vating key also shown; 34 respectively ontheir upper edges adjacent Fig. 3 is a front View of one of theoperating the slots 18, 19 and 20 respectively. On the levers; cornersof the upper edges of the levers 8, 9 and Fig. 4 is a front perspectiveview of the barrel 10 nearest a barrel housing 35 are projections or'housing shown in Fig. 2. toes 36, 37 and 38 respectively. These notchesWithin the barrel 1 is a keyslot 2 into which the and projections ortoes are for the purpose of operating key 3 is adapted to be inserted.The preventing a person fraudulently determining the sides of the slot 2are notched or fluted to corcombination of the lock.

respond with fiutings which are placed in the A barrel housing 35rigidly attached to the cas- 4sides of the key 3- These flutinss extendthroushing 39 of the ock is so designed that it extends Out the entirebarrel 1 and are SO designed that around that part of the barrel 1 notadjacent the no fiat blank can be inserted into the barrel 1 levers 3, 9and 10 and the partition 27 On the and to make it difficult tomanipulate a tool thereupper portion of the barrel housing 35 is a proin for the purpose of picking the lock- The rear jection 40 whichextends over to and contacts end; Of the barretl has a Cam 01' level'member 5 with the faces 41, 42 and 43 of the levers s, 9 and WmchContacts Wlth the Sweep 6 of the bolt 7 to 10 respectively when the bolt7 is in its locked withdraw the bolt upon rotation of the barrel 1.position as Shown in Fig 1 It is impossible,

The levers or tumblers 8' 9 .and 10 27.6 plvoted on therefore, todetermine the relative positions of the post 11 and are all of differentwidths so that th e slots 18, 19 and 20 in the levers 8, 9 and 10,

ther key operating faces 12, 13 and 14 extend t. 1 b f t 1 ,t d

to such distances toward the barrel 1 that they fespec lve y, y meatls oafiny 00 *nse e 95,

rub against bits 15, 16 and 17 respectively of the hrough me key Opemng',Th-ls Wlu be Obvlous key 3 as the barrel 1 is rotated by the key 3,caus from the fact that a tool nserted between the fixed projecton 40will move the levers out of ing as the barrel l is further rotated, thelevers I to move in a dn-ootion away from the barrel 1 position and willalways be in forced contact with 4'...until the slots 18, 19 and 20 inthe levers a, 9 the face of the lever being caused thus prea and 10respeotivdy are under a projection 21 on venting free movement of thetool across the the bolt 12. At this point the barrel has rotated top Ofthe lever Which is necessary to feel and sufiiciently to cause the camor lever 5 to engage determine the position of the slot. the sweep 6 onthe bolt 7 and upon further rota- What is claimed is: I Po tion of thebarrel 1 by the key 3, the bolt 7 is 1. A lock comprising a casing, abarrel having completely withdrawn, the projection 21 passing a keyslottherein, a bolt, a plurality of levers into the slots 18, 19 and 20 ofthe levers. The pivoted at one end for controlling the retraction levers8, 9 and 10 are moved against the pressure of said bolt, and meansrigidly fixed to said casof the springs 22, 23 and 24 respectively Whiching and adapted to engage the faces of said levers are attached to thelevers at one end and bear in their locking positions to prevent meansinserted through said keyslot from measuring the free ends of saidlevers.

2. A lock comprising a casing, a barrel having a keyslot therein, abolt, a plurality of levers pivoted at one end for controlling theretraction of said bolt, and means rigidly fixed to said casing adjacentthe free ends of said levers to prevent means inserted through saidkeyslot from determining the combination of said levers.

3. A lock comprising a casing, a barrel having a keyslot therein, saidslot being so grooved as to prevent manipulation of a tool therein, ahousing for said barrel permanently and rigidly fixed to said casing, abolt, a plurality of levers pivoted at one end for controlling theretraction of said bolt, a projection and a notch spaced apart on thefree ends of said levers, and means on said barrel housing adjacent thefree ends of all of said levers to prevent means inserted through saidkeyslot from determining the combination of said levers.

4. A lock comprising a casing, a barrel having a keyslot therein, abolt, a plurality of pivoted levers having surfaces for engaging saidbolt at one end and a housing for said barrel permanently and rigidlyfixed to said casing, said housing having a laterally extendingprojection engaging all of said levers to prevent access through saidkeyslot to the bolt engaging surfaces of said levers in their normalhlocked position.

5. A lock comprising a bolt, a plurality of levers for controlling theretraction of said bolt, a barrel having a keyslot therein, a housingextending substantially the full length of and surrounding said barrel,means for permanently and rigidly securing said housing to said casing,said housing having an opening extending longitudinally thereof topermit access to the key contacting surfaces of said levers, the upperportion of said housing engaging all of said levers When said bolt is inlocked position to prevent access to the free ends of said leversthrough said keyslot.

LOUIS GUTMAN.

